Fixed BlockTypeRandomizer BigArrayBlock generation

Author: ivancea

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/data/BlockTypeRandomizer.java

@@ -77,7 +77,7 @@ public static IntBlock randomizeBlockType(IntBlock block) {
             }
 
             int[] values = new int[totalValues];
-            for (int i = 0; i < values.length; i++) {
+            for (int i = 0; i < totalValues; i++) {
                 values[i] = block.getInt(i);
             }
 
@@ -93,7 +93,7 @@ public static IntBlock randomizeBlockType(IntBlock block) {
         }
 
         var intArray = blockFactory.bigArrays().newIntArray(totalValues);
-        for (int i = 0; i < block.getPositionCount(); i++) {
+        for (int i = 0; i < totalValues; i++) {
             intArray.set(i, block.getInt(i));
         }